You could still get one if you have concerns. It will give you basic info and some idea of what area of the car in which the fault has been detected... just be aware it's a generic thing and may end up being useless, which could get expensive if you chase the fault. High end cars and those with optional extras tend not to have all that stuff listed, so the scanner is just a starting point for diagnosis:
"All OBD2 scanners can retrieve basic trouble codes, but some are unable to read manufacturer-specific codes. Consider getting separate make-specific scanners for different car brands to perform more in-depth diagnostics".
"Parts or components should not be replaced with reference to only a DTC. The vehicle service manual should be consulted for more information on possible causes of the fault,along with required testing.
For example, if a DTC reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.
DTCs may also be triggered by faults earlier down the line. For example, a dirty MAF sensor might be causing the car to overcompensate in its fuel-trim adjustments.As a result, oxygen sensors are likely to report fuel mixture problems".
Torque Pro, mentioned above, can be fun if you're really into your car, though. Real Time data, especially. I have it, but almost never use it these days as my mate is a mechanic with all the pro software.
